CN107171166A - Terahertz quantum cascaded laser phase-locked system and method - Google Patents
Terahertz quantum cascaded laser phase-locked system and method Download PDFInfo
- Publication number
- CN107171166A CN107171166A CN201710532857.1A CN201710532857A CN107171166A CN 107171166 A CN107171166 A CN 107171166A CN 201710532857 A CN201710532857 A CN 201710532857A CN 107171166 A CN107171166 A CN 107171166A
- Authority
- CN
- China
- Prior art keywords
- terahertz
- signal
- phase
- cascaded laser
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
Abstract
The present invention provides a kind of Terahertz quantum cascaded laser phase-locked system and phase-lock technique, and phase-locked system includes：Terahertz light source module, the output for realizing terahertz signal；Terahertz signal down conversion module, is connected with terahertz light source module, for receiving the terahertz signal and producing the beat signal of terahertz signal；Phase module is locked, is connected with terahertz signal down conversion module, for receiving the beat signal and producing driving thermal compensation signal, the driving thermal compensation signal is inputted to terahertz light source module, the lock phase for realizing Terahertz quantum cascaded laser.By such scheme, the present invention is taken the lead in carrying out terahertz signal down coversion using Terahertz quantum well detector, and mixed frequency signal is fast and accurately extracted in realization；Traditional radio frequency frequency multiplier chain Terahertz local vibration source is replaced from multimode Terahertz quantum cascaded laser, realizes that down coversion significantly reduces the difficulty and complexity of Phase Lock Technique system constructing using the beat signal of itself.
Description
Technical field
The invention belongs to optical application technical field, more particularly to a kind of Terahertz quantum cascaded laser phase-locked system
And method.
Background technology
Terahertz (Terahertz, THz) ripple is located between millimeter wave and far ir ray in electromagnetic spectrum, public
Safety, communications are biomedical, the field such as control of product quality and atmosphere environment supervision show great application potential and
Value.In numerous THz research directions, THz light sources are considered as mostly important technical foundation.The stable THz of one performance
Light source, it will greatly improve the actual effect of related THz application technologies and system, such as THz imaging resolutions, THz communication bandwidths
And spectral matching factor efficiency etc. is closely bound up with THz quality light sources.In numerous THz light sources, THz QCL are with its height output work(
The characteristics of rate, high spectrum quality and small volume easy of integration, is widely studied in THz fields.At present, THz QCL frequency spectrum covering
Scope has been realized in the covering of 1.2~5.2THz frequency ranges, and maximum operating temperature has reached 200K, and continuous wave output power surpasses
100mW is crossed, pulse exports peak power more than 1W, etc., while by introducing tunable technology, THz QCL have been carried out
300GHz spectral bandwidth output, makes its being applied to for reality in high-precision spectral range.
However, THz QCL stability is always the emphasis research topic in THz fields, THz QCL belong to intersubband jump
The semiconductor laser moved, its transition energy level difference is small, is highly prone to the influence of device internal heat effect, causes the transmitting frequency of laser
Rate is unstable.
For the tranmitting frequency of stable laser, researchers have carried out substantial amounts of research, up to the present, using most
Mode be outer mixed phase compensation method, this method is in millimeter wave frequency band extensive use.But continue to use this scheme in THz frequency ranges
The frequency stabilization (locking phase) of laser is carried out, there are very high technical requirements, main reason is that following 2 points：1) THz frequency ranges
Inherently lack can as standard light source, i.e., without suitable local vibration source, so the overwhelming majority will be using will in current scheme
The radiofrequency signal of high stability carries out repeatedly frequency multiplication (tens times) to reach THz frequency ranges, and is used as local vibration source with this；2) Gao Ling
Sensitivity and wide bandwidth frequency mixer, the frequency mixer species suitable for THz frequency ranges is few at present, and main has Schottky diode
(SD), thermoelectron radiometer (HEB) and nonlinear crystal etc., and these frequency mixer performance differences are substantially, often with difference
Condition of work and response characteristic, accommodation is narrow.
In view of can only be using radio frequency times in the scarcity of THz local vibration sources and high-quality frequency mixer, current THz QCL Phase Lock Techniques
The combination of frequency local vibration source combination ultralow temperature frequency mixer, but there is following several respects weak point in such scheme：1) use and penetrate
Frequency frequency multiplication source is used as THz local vibration sources, it usually needs the rate-adaptive pacemaker higher than 2THz, frequency multiplier chain could be realized by carrying out tens times of frequencys multiplication
Road is complicated and cost is very high, in addition, the power output of multiple frequence link is extremely low (micromicrowatt rank), causes mixing efficiency to reduce；
2) frequency mixer need to use ultralow temperature highly-sensitive detector, the thermoelectron detector for being such as operated under extremely low temperature and (being less than 1K),
Effective mixing to small-signal could be realized, very low operation temperature directly limit the extensive use of the technology；3) phase is mended
Repay bandwidth in mechanism to limit, be mixed by the first order, the signal generally yielded is in GHz ranks, if directly carried out with this signal
Phase compensation, then it is too high to the bandwidth requirement of compensation circuit, it is necessary to which being customized design, reduces the versatility of technology.To the greatest extent
Pipe is proposed such as using normal temperature Schottky diode as frequency mixer for the improvement of THz QCL Phase Lock Techniques, or reduction frequency multiplication
The prioritization schemes such as link series, but effect is limited.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of Terahertz quantum cascaded laser
Device phase-locked system and method, for solving in the prior art due to chain caused by the scarcity of THz local vibration sources and high-quality frequency mixer
The technical problem such as road complexity cost height and the low, poor universality of mixing efficiency.
In order to achieve the above objects and other related objects, the present invention, which provides a kind of Terahertz quantum cascaded laser and locked, is mutually
System, including：
Terahertz light source module, including Terahertz quantum cascaded laser, the output for realizing terahertz signal；
Terahertz signal down conversion module, is connected with the terahertz light source module, for receiving the Terahertz letter
Number and produce the beat signal of the terahertz signal, to realize frequency down-conversion function；
Phase module is locked, is connected with the terahertz signal down conversion module, for receiving the beat signal, and foundation
The beat signal produces driving thermal compensation signal, and the driving thermal compensation signal is inputted to the terahertz light source module, for reality
The lock phase of the existing Terahertz quantum cascaded laser.
As a preferred embodiment of the present invention, the terahertz signal down conversion module is detected including Terahertz quantum trap
Device, the Terahertz quantum well detector is used as frequency mixer, the beat signal for obtaining the terahertz signal, the terahertz
Hereby quantum well detector is the multi-quantum pit structure detector of AlGaAs/GaAs material systems.
As a preferred embodiment of the present invention, the terahertz signal down conversion module also includes microstrip line, described micro-
Band line is arranged at the Terahertz quantum well detector top, for exporting the beat signal, the frequency of the beat signal
Less than 50GHz.
As a preferred embodiment of the present invention, the terahertz signal down conversion module also includes the amplification being sequentially connected
Device and bias device, wherein, described amplifier one end is connected with the Terahertz quantum well detector, for amplifying the beat frequency
Signal, described bias device one end is connected with the lock phase module, for the beat signal that will amplify through the amplifier
Transmit to the lock phase module.
As a preferred embodiment of the present invention, the lock phase module includes beat signal down-converter unit, the beat frequency
Signal down-converter unit includes frequency mixer and local vibration source, wherein, the frequency mixer receives the terahertz signal down conversion module
The beat signal produced, and itself and the local vibration source be mixed obtaining difference frequency signal, to realize the beat signal
Down coversion, the difference of the frequency of the frequency of the local vibration source and the beat signal is less than 500MHz.
As a preferred embodiment of the present invention, the lock phase module also includes phase compensation unit, the phase compensation
Unit is PID controller；The phase compensation unit is connected to receive the difference frequency with the beat signal down-converter unit
Signal, and the difference frequency signal is compared with preset reference signal, to produce the driving thermal compensation signal.
As a preferred embodiment of the present invention, the Terahertz quantum cascaded laser is AlGaAs/GaAs material bodies
The laser of the multi-quantum pit structure of system, its active area is to tie up state having to continuous state transition mechanism with resonance phonon scattered-out beam
Source region；The Terahertz quantum cascaded laser laser spectrum is bimodulus pattern or multimodal modal.
The present invention also provides a kind of Terahertz quantum cascaded laser phase-lock technique, comprises the following steps：
1) a Terahertz quantum cascaded laser phase-locked system as described in above-mentioned any one scheme is provided；
2) to the Terahertz quantum cascaded laser load driver signal, so that it produces terahertz signal；
3) terahertz signal is transmitted to the terahertz signal down conversion module, and produces the terahertz signal
Beat signal, realize down coversion；
4) beat signal is transmitted to the lock phase module, and driving compensation letter is produced according to the beat signal
Number, the driving thermal compensation signal is superimposed to the drive signal, the drive signal is made jointly with the driving thermal compensation signal
For the Terahertz quantum cascaded laser, to realize the lock phase of the Terahertz quantum cascaded laser.
It is used as a preferred embodiment of the present invention, step 2) in, the mode for producing the terahertz signal is：By described in too
Hertz QCL is placed in low temperature cold head, when the temperature of the low temperature cold head is less than 20K, to the Terahertz amount
Qc laser loads the drive signal, so that the Terahertz quantum cascaded laser launches the terahertz signal.
It is used as a preferred embodiment of the present invention, step 3) in, the terahertz signal down conversion module includes Terahertz
Quantum well detector, its mode for producing the beat signal is：The terahertz signal is transmitted via off axis paraboloidal mirror
Optical frequency mixing is carried out on to the photosurface of the Terahertz quantum well detector, is believed with the beat frequency for producing the terahertz signal
Number；The mode that the Terahertz quantum well detector carries out signal coupling is 45 ° of inclined-plane incidences or optical grating construction to incidence.
It is used as a preferred embodiment of the present invention, step 4) in, the driving thermal compensation signal is produced by PID control principle
It is raw.
As described above, the complete denomination of invention of the present invention, has the advantages that：
1) phase-locked system and method for Terahertz quantum cascaded laser provided by the present invention, takes the lead in using THz QWP
Down coversion is carried out to THz frequency signals, can realize and fast and accurately extract mixed frequency signal；
2) phase-locked system and method for Terahertz quantum cascaded laser provided by the present invention, using multimode THz QCL
Instead of traditional radio frequency frequency multiplier chain THz local vibration sources, realize that down coversion significantly reduces lock using the beat signal of laser itself
Difficulty and complexity that phase technological system is built；
3) present invention realizes the down coversion of high frequency THz signals by extracting the beat signal of multimode spectrum, substitutes traditional
Radio frequency frequency multiplier chain local vibration source, is greatly reduced technical costs and difficulty, while control accuracy is retained, significantly reduces THz
The complexity of frequency range Phase Lock Technique and system, improves the defect of traditional THz frequency ranges Phase Lock Technique.
Brief description of the drawings
Fig. 1 is shown as each module annexation signal for the Terahertz quantum cascaded laser phase-locked system that the present invention is provided
Figure.
Fig. 2 is shown as the structural representation for the Terahertz quantum cascaded laser phase-locked system that the present invention is provided.
The terahertz light source module that Fig. 3 is shown as the Terahertz quantum cascaded laser phase-locked system that the present invention is provided is produced
Thz laser spectrum schematic diagram.
Fig. 4 is shown as the terahertz signal down coversion mould for the Terahertz quantum cascaded laser phase-locked system that the present invention is provided
The collection of illustrative plates schematic diagram of the beat signal for the terahertz signal that block is produced.
Fig. 5 is shown as each flow chart of steps for the Terahertz quantum cascaded laser phase-lock technique that the present invention is provided.
Component label instructions
1 terahertz light source module
11 Terahertz quantum cascaded lasers
12 driving power supplies
2 terahertz signal down conversion modules
21 Terahertz quantum well detectors
22 amplifiers
23 bias devices
24 spectrum analysis equipment
3 lock phase modules
31 beat signal down-converter units
311 local vibration sources
312 frequency mixers
32 phase compensation units
S1~S4 steps
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
Fig. 1 is referred to Fig. 5.It should be noted that the diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, though only display is with relevant component in the present invention rather than according to package count during actual implement in diagram
Mesh, shape and size are drawn, and form, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its
Assembly layout form may also be increasingly complex.
As shown in Figures 1 and 2, the present invention provides a kind of Terahertz quantum cascaded laser phase-locked system, including：
Terahertz light source module 1, including Terahertz quantum cascaded laser 11, the output for realizing terahertz signal；
Terahertz signal down conversion module 2, is connected with the terahertz light source module 1, for receiving the Terahertz
Signal and the beat signal for producing the terahertz signal, to realize frequency down-conversion function；
Phase module 3 is locked, is connected with the terahertz signal down conversion module 2, for receiving the beat signal, and according to
Driving thermal compensation signal is produced according to the beat signal, the driving thermal compensation signal is inputted to the terahertz light source module 1, is used for
Realize the lock phase of the Terahertz quantum cascaded laser.
Specifically, the terahertz light source module 1 is used to produce terahertz signal, as target source, wherein, the terahertz
Hereby QCL 11 is launched as the core of the terahertz light source module 1 for signal.
As an example, the Terahertz quantum cascaded laser 21 is the MQW knot of AlGaAs/GaAs material systems
The laser of structure, its active area is to tie up state to the active area of continuous state transition mechanism with resonance phonon scattered-out beam.
As an example, the spectral signature for the terahertz signal that the terahertz light source module 1 is exported is bimodulus pattern
Or multimodal modal.
Specifically, the parameter of the Terahertz quantum cascaded laser 11 can arbitrarily be set according to actual demand, do not do
Concrete restriction, it is preferable that be Al0.25Ga0.75As/GaAs multi-quantum pit structures, and its active area length is 3~9mm, is preferably
6mm, centre frequency is 3~6THz, preferably 4.27THz.In addition, the laser spectrum of its transmitting is as shown in figure 3, the Terahertz
QCL 21 is preferably dual-mode of operation pattern, further, and the beat signal of its bimodulus is 10~20GHz, in this reality
Apply in example is 15GHz.In the present embodiment, the frequency of the terahertz signal of generation is located between 1~5THz.
As an example, the terahertz light source module 1 also includes driving power supply 12, for be described Terahertz quantum cascaded
Laser provides drive signal, so that it produces the terahertz signal.
Specifically, the driving power supply 12 can be voltage driving or electric current driving, in the present embodiment, select as electric current
Driving, size is 800~900mA, preferably 870mA, and more preferably continuous wave mode of operation, certainly, the terahertz
Hereby QCL 11 can also produce drive signal using external drive power supply and be driven, and not do specific limit herein
System.
As an example, the terahertz signal down conversion module 2 includes Terahertz quantum well detector 21, the Terahertz
Quantum well detector 21 is as frequency mixer, the beat signal for obtaining the terahertz signal.
As an example, the Terahertz quantum well detector 21 is the multi-quantum pit structure of AlGaAs/GaAs material systems
Detector.
As an example, the terahertz signal down conversion module 2 also includes microstrip line (not shown), the microstrip line
The top of Terahertz quantum well detector 21 is arranged at, for exporting the beat signal.
As an example, the frequency of the beat signal is less than 50GHz.
Specifically, the features such as Terahertz quantum well detector 21 possesses high sensitivity and wide bandwidth, can realize fast
It is fast accurately to extract mixed frequency signal, and THz QWP response half-peak matches (i.e. THz QCL transmittings with THz QCL emission spectrum
Spectrum is located within THz QWP half-peak frequency ranges), in the present embodiment, multimode THz signals are by transmitting optic path extremely
On THz QWP photosurfaces, THz QWP receive multimode THz signals and produce beat signal, further, THz by photomixing effect
The fundamental frequency signal of beat signal is exported by QWP high frequency output end, wherein, acquired down-conversion signal is no more than 50GHz, with
Specific multi-mode laser spectrum is defined, and is 20GHz in the present embodiment, is the beat signal between THz QCL multimodes.
Specifically, the producing method of the beat signal is：The terahertz signal is transmitted via off axis paraboloidal mirror
Optical frequency mixing is carried out on to the photosurface of the Terahertz quantum well detector 21, is believed with the beat frequency for producing the terahertz signal
Number, it is 45 ° of inclined-plane incidences or optical grating construction to incidence that it, which carries out mode of signal coupling, the Terahertz quantum trap detection
The mesa dimensions of device 21 are 400*400um2, operating temperature is 3~7K, preferably 5K, the bias voltage of loading for 80~
140mV, preferably 110mV, it in 0.4~0.8A/W, the present embodiment is 0.65A/W that its corresponding QWP responsiveness, which is,.Enter one
Step, the beat signal selection is fundamental frequency signal, and is drawn by high-frequency line (microstrip line as described), to carry out subsequent operation.
As an example, the terahertz signal down conversion module 2 also includes amplifier 22 and the bias device 23 being sequentially connected,
Wherein, described one end of amplifier 22 is connected with the Terahertz quantum well detector 21, for amplifying the beat signal, institute
State the one end of bias device 23 with the lock phase module 3 to be connected, the beat signal for through the amplifier 22 will amplify is passed
Transport to the lock phase module 3.
As an example, the terahertz signal down conversion module 2 also includes spectrum analysis equipment 24, for showing and monitoring
The beat signal.
Specifically, the beat signal also further amplifies via the amplifier, the biasing of the amplifier loading is straight
Stream signal magnitude is 0.5~2.5A, and selection is 1.46A in the present embodiment, then extracts high-frequency signal (such as institute by trapezoidal bias device
State fundamental frequency signal) frequency mixer in the spectrum analysis equipment (such as spectrum analyzer) and the lock phase module is transmitted separately to,
The spectrum analysis equipment shows and monitors beat signal, and the beat signal is as shown in Figure 4.
As an example, the lock phase module 3 includes beat signal down-converter unit 31, the beat signal down-converter unit
31 include frequency mixer 312 and local vibration source 311, wherein, the frequency mixer 312 receives the terahertz signal down conversion module 2 and produced
The raw beat signal, and it be mixed obtaining difference frequency signal with the local vibration source 311, to realize the beat signal
Down coversion.
As an example, the difference of the frequency of the local vibration source 311 and the frequency of the beat signal is less than 500MHz.
Specifically, the local vibration source 311 is RF local oscillator source, its as the beat signal local vibration source and the beat frequency
Signal is mixed, and obtains difference frequency signal (i.e. phase error signal), to realize the down coversion of the beat signal, difference frequency letter
It number can change (usually, variable quantity and target source is linear) with the change of THz QCL tranmitting frequencies, for table
The stability of THz QCL frequencies is levied, while the demand to interlock circuit bandwidth in the phase compensation unit can be reduced, makes phase
Position compensation is easily achieved.
Specifically, in the present embodiment, the frequency mixer 312 is microwave mixer, it is of course also possible to common for this area
Any frequency mixer known to technical staff, wherein, the bias voltage of the frequency mixer 312 is 2~5V, and the present embodiment selection is
3.5V, in addition, the frequency of the local vibration source 311 is 12~18GHz, the present embodiment selection is 15.4GHz, through the microwave mixer
Device is mixed the frequency of obtained difference frequency signal for 90~150MHz, is 122MHz in the present embodiment.
As an example, the lock phase module 3 also includes phase compensation unit 32, the phase compensation unit 32 is clapped with described
Frequency signal down-converter unit 31 is connected to receive the difference frequency signal, and the difference frequency signal and preset reference signal is carried out
Compare, to produce the driving thermal compensation signal.
As an example, the phase compensation unit 32 is PID controller.
Specifically, the difference frequency signal of the beat signal down conversion module output continues to transmit to the phase compensation
Unit, calculates the error between real-time difference frequency signal and reference signal, and pass through negative feedback mechanism by phase compensation unit
The drive signal that corresponding electric signal is used to compensate THz QCL is produced, so as to realize the stable output of frequency.In addition, the phase
Position compensating unit adoption rate-Integrated Derivative control principle (i.e. PID principles), its function is the data being collected into and one
Reference value is compared, and then this difference is used to calculate new input value, the purpose of this new input value is to allow
The data of system reach or are maintained at reference value.
In the present embodiment, the difference frequency signal frequency 122MHz that microwave mixer mixing is obtained, phase is used as using this frequency values
The reference value of proportional-integral derivative controller in the compensating module of position, it is final to determine PID controller ginseng by multiple parameter testing
Number sets as follows：Proportional gain Kc=0.5, integration time constant Ti=3* (1/122MHz), derivative time constant Td=(1/3) *
(1/122MHz), is acted on after PID controller current output terminal is in parallel with THz QCL driving current on THz QCL devices,
Realize the purpose of stable THz QCL frequency spectrums.
As shown in figure 5, the present invention also provides a kind of Terahertz quantum cascaded laser phase-lock technique, the phase-lock technique is
The method that the phase-locked system provided using the present embodiment enters horizontal lock, comprises the following steps：
1) a Terahertz quantum cascaded laser phase-locked system as described above described in any scheme is provided；
2) to the load driver signal of Terahertz quantum cascaded laser 11, so that it produces terahertz signal；
3) terahertz signal is transmitted to the terahertz signal down conversion module 2, and produces the Terahertz letter
Number beat signal, realize down coversion；
4) beat signal is transmitted to the lock phase module 3, and driving compensation letter is produced according to the beat signal
Number, the driving thermal compensation signal is superimposed to the drive signal, the drive signal is made jointly with the driving thermal compensation signal
For the Terahertz quantum cascaded laser 11, to realize the lock phase of the Terahertz quantum cascaded laser.
As an example, step 2) in, the mode for producing the terahertz signal is：By the Terahertz quantum cascaded laser
Device puts 11 in low temperature cold head, when the temperature of the low temperature cold head is less than 20K, to the Terahertz quantum cascaded laser 11
The drive signal is loaded, so that the Terahertz quantum cascaded laser 11 launches the terahertz signal.
Specifically, to the load driver signal of Terahertz quantum cascaded laser 11, so that it produces terahertz signal,
The drive signal can for voltage driving or electric current driving, in the present embodiment, select for electric current drive, size be 800~
900mA, preferably 870mA, and more preferably continuous wave mode of operation, the laser spectrum that it is launched are as shown in Figure 3.
As an example, step 3) in, the terahertz signal down conversion module 2 includes Terahertz quantum well detector 21,
Its mode for producing the beat signal is：The terahertz signal is transmitted to the Terahertz amount via off axis paraboloidal mirror
Optical frequency mixing is carried out on the photosurface of sub- well detector 21, to produce the beat signal of the terahertz signal.
As an example, it is 45 ° of inclined-plane incidences that the Terahertz quantum well detector 21, which carries out the mode of signal coupling,
Or optical grating construction is to incidence.
As an example, the operating temperature of the Terahertz quantum well detector 21 is 3~7K, the bias voltage of loading is 80
~140mV.
Specifically, multimode THz signals are by transmitting optic path to THz QWP photosurfaces, THz QWP receive multimode
THz signals simultaneously produce beat signal by photomixing effect, and further, the fundamental frequency signal of THz beat signals is defeated by QWP high frequency
Go out end export, the mode that the Terahertz quantum well detector 21 carries out signal coupling is 45 ° of inclined-plane incidences or grating knot
Structure is to incidence, and its mesa dimensions is 400*400um2, operating temperature is 3~7K, preferably 5K, the bias voltage of loading for 80~
140mV, preferably 110mV, it in 0.4~0.8A/W, the present embodiment is 0.65A/W that its corresponding QWP responsiveness, which is,.
As an example, step 4) in, the driving thermal compensation signal is produced by PID control principle.
Specifically, the difference frequency signal of the beat signal down conversion module output continues to transmit to the phase compensation
Unit, calculates the error between real-time difference frequency signal and reference signal, and pass through negative feedback mechanism by phase compensation unit
The drive signal that corresponding electric signal is used to compensate THz QCL is produced, so as to realize the stable output of frequency.In addition, the phase
Position compensating unit adoption rate-Integrated Derivative control principle (i.e. PID principles), its function is the data being collected into and one
Reference value is compared, and then this difference is used to calculate new input value, the purpose of this new input value is to allow
The data of system reach or are maintained at reference value.
In the present embodiment, the difference frequency signal frequency 122MHz that microwave mixer mixing is obtained, phase is used as using this frequency values
The reference value of proportional-integral derivative controller in the compensating module of position, it is final to determine PID controller ginseng by multiple parameter testing
Number sets as follows：Proportional gain Kc=0.5, integration time constant Ti=3* (1/122MHz), derivative time constant Td=(1/
3) * (1/122MHz), acts on THz QCL devices after PID controller current output terminal is in parallel with THz QCL driving current
On, realize the purpose of stable THz QCL frequency spectrums.
In summary, the present invention provides a kind of Terahertz quantum cascaded laser phase-locked system and phase-lock technique, the lock
Phase system includes：Terahertz light source module, including Terahertz quantum cascaded laser, the output for realizing terahertz signal；
Terahertz signal down conversion module, is connected with the terahertz light source module, for receiving the terahertz signal and producing
The beat signal of the terahertz signal, to realize frequency down-conversion function；Phase module is locked, with the terahertz signal down conversion module
It is connected, driving thermal compensation signal, the driving compensation letter is produced for receiving the beat signal, and according to the beat signal
Number input to the terahertz light source module, the lock phase for realizing the Terahertz quantum cascaded laser.Pass through above-mentioned side
Case, the phase-locked system and method for Terahertz quantum cascaded laser provided by the present invention take the lead in using THz QWP to THz frequencies
Rate signal carries out down coversion, can realize and fast and accurately extract mixed frequency signal；Traditional radio frequency is replaced using multimode THz QCL
Frequency multiplier chain THz local vibration sources, realize that down coversion significantly reduces Phase Lock Technique system constructing using the beat signal of laser itself
Difficulty and complexity；The down coversion of high frequency THz signals is realized by extracting the beat signal of multimode spectrum, traditional penetrate is substituted
Frequency frequency multiplier chain local vibration source, is greatly reduced technical costs and difficulty, while control accuracy is retained, and significantly reduces THz frequencies
The complexity of section Phase Lock Technique and system, improves the defect of traditional THz frequency ranges Phase Lock Technique.So, the present invention effectively overcomes
Various shortcoming of the prior art and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (11)
1. a kind of Terahertz quantum cascaded laser phase-locked system, it is characterised in that including：
Terahertz light source module, including Terahertz quantum cascaded laser, the output for realizing terahertz signal；
Terahertz signal down conversion module, is connected with the terahertz light source module, for receiving the terahertz signal simultaneously
The beat signal of the terahertz signal is produced, to realize frequency down-conversion function；
Phase module is locked, is connected with the terahertz signal down conversion module, for receiving the beat signal, and according to described
Beat signal produces driving thermal compensation signal, and the driving thermal compensation signal is inputted to the terahertz light source module, for realizing
State the lock phase of Terahertz quantum cascaded laser.
2. Terahertz quantum cascaded laser phase-locked system according to claim 1, it is characterised in that the Terahertz letter
Number down conversion module includes Terahertz quantum well detector, and the Terahertz quantum well detector is as frequency mixer, for obtaining
The beat signal of the terahertz signal, the Terahertz quantum well detector is the Multiple-quantum of AlGaAs/GaAs material systems
Well structure detector.
3. Terahertz quantum cascaded laser phase-locked system according to claim 2, it is characterised in that the Terahertz letter
Number down conversion module also includes microstrip line, and the microstrip line is arranged at the Terahertz quantum well detector top, for exporting
The beat signal, the frequency of the beat signal is less than 50GHz.
4. Terahertz quantum cascaded laser phase-locked system according to claim 2, it is characterised in that the Terahertz letter
Number down conversion module also includes amplifier and the bias device being sequentially connected, wherein, described amplifier one end and the Terahertz amount
Sub- well detector is connected, and for amplifying the beat signal, described bias device one end is connected with the lock phase module, is used for
The beat signal amplified through the amplifier is transmitted to the lock phase module.
5. Terahertz quantum cascaded laser phase-locked system according to claim 1, it is characterised in that the lock phase module
Including beat signal down-converter unit, the beat signal down-converter unit includes frequency mixer and local vibration source, wherein, the mixing
Device receives the beat signal that the terahertz signal down conversion module is produced, and itself and the local vibration source be mixed
To difference frequency signal, to realize the down coversion of the beat signal, the frequency of the local vibration source and the frequency of the beat signal
Difference is less than 500MHz.
6. Terahertz quantum cascaded laser phase-locked system according to claim 5, it is characterised in that the lock phase module
Also include phase compensation unit, the phase compensation unit is PID controller；The phase compensation unit and the beat signal
Down-converter unit is connected to receive the difference frequency signal, and the difference frequency signal is compared with preset reference signal, with
Produce the driving thermal compensation signal.
7. Terahertz quantum cascaded laser phase-locked system according to claim 1, it is characterised in that the Terahertz amount
Qc laser is the laser of the multi-quantum pit structure of AlGaAs/GaAs material systems, and its active area is with resonance sound
Son scattering active area of the bound state to continuous state transition mechanism；The Terahertz quantum cascaded laser laser spectrum is bimodulus mould
Formula or multimodal modal.
8. a kind of Terahertz quantum cascaded laser phase-lock technique, it is characterised in that comprise the following steps：
1) provide just like the Terahertz quantum cascaded laser phase-locked system described in any one in claim 1~7；
2) to the Terahertz quantum cascaded laser load driver signal, so that it produces terahertz signal；
3) terahertz signal is transmitted to the terahertz signal down conversion module, and produces the bat of the terahertz signal
Frequency signal, realizes down coversion；
4) beat signal is transmitted to the lock phase module, and driving thermal compensation signal is produced according to the beat signal, will
The driving thermal compensation signal is superimposed to the drive signal, and the drive signal is with the driving thermal compensation signal collective effect in institute
Terahertz quantum cascaded laser is stated, to realize the lock phase of the Terahertz quantum cascaded laser.
9. Terahertz quantum cascaded laser phase-lock technique according to claim 8, it is characterised in that step 2) in, production
The mode of the raw terahertz signal is：The Terahertz quantum cascaded laser is placed in low temperature cold head, in the low temperature
When the temperature of cold head is less than 20K, the drive signal is loaded to the Terahertz quantum cascaded laser, so that the Terahertz
QCL launches the terahertz signal.
10. the Terahertz quantum cascaded laser phase-lock technique stated according to claim 8, it is characterised in that step 3) in, it is described
Terahertz signal down conversion module includes Terahertz quantum well detector, and its mode for producing the beat signal is：Will be described
Terahertz signal transmits via off axis paraboloidal mirror and carries out optical frequency mixing to the photosurface of the Terahertz quantum well detector,
To produce the beat signal of the terahertz signal；The mode that the Terahertz quantum well detector carries out signal coupling is 45 °
Inclined-plane incidence or optical grating construction are to incidence.
11. Terahertz quantum cascaded laser phase-lock technique according to claim 15, it is characterised in that step 4) in,
The driving thermal compensation signal is produced by PID control principle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532857.1A CN107171166B (en) | 2017-07-03 | 2017-07-03 | Terahertz quantum cascaded laser phase-locked system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532857.1A CN107171166B (en) | 2017-07-03 | 2017-07-03 | Terahertz quantum cascaded laser phase-locked system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107171166A true CN107171166A (en) | 2017-09-15 |
| CN107171166B CN107171166B (en) | 2019-07-09 |
Family
ID=59827516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710532857.1A Active CN107171166B (en) | 2017-07-03 | 2017-07-03 | Terahertz quantum cascaded laser phase-locked system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107171166B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196412A (en) * | 2018-01-08 | 2018-06-22 | 山西大学 | A kind of 10MHz-10GHz optical phase-locked loops device |
| CN108398691A (en) * | 2018-05-25 | 2018-08-14 | 中国工程物理研究院流体物理研究所 | A kind of difference frequency signal generation device and method |
| CN108535891A (en) * | 2018-04-11 | 2018-09-14 | 雄安华讯方舟科技有限公司 | A kind of THz wave wave-front phase modulation method |
| CN110672548A (en) * | 2019-09-18 | 2020-01-10 | 雄安华讯方舟科技有限公司 | Terahertz multimode continuous wave amplitude spectrum system and terahertz signal generating device |
| CN112964901A (en) * | 2021-02-07 | 2021-06-15 | 中南大学 | Fluid flow velocity measuring device based on terahertz high-speed echo effect |
| CN113608175A (en) * | 2021-08-03 | 2021-11-05 | 上海无线电设备研究所 | RCS measurement transceiving system based on quantum cascade |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174719A (en) * | 2007-10-23 | 2008-05-07 | 中国计量学院 | Terahertz wave switch device and method thereof |
| CN102623872A (en) * | 2012-03-23 | 2012-08-01 | 中国科学院紫金山天文台 | Quantum cascade laser (QCL) phase-locked system using solid-state semiconductor source harmonic as reference source |
| CN102749341A (en) * | 2012-07-11 | 2012-10-24 | 中国科学院上海微系统与信息技术研究所 | Tomography imaging system and method based on terahertz quantum device |
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN106442394A (en) * | 2016-09-28 | 2017-02-22 | 中国科学院上海微系统与信息技术研究所 | Terahertz near-field imaging system and terahertz near-field imaging method |
-
2017
- 2017-07-03 CN CN201710532857.1A patent/CN107171166B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174719A (en) * | 2007-10-23 | 2008-05-07 | 中国计量学院 | Terahertz wave switch device and method thereof |
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN102623872A (en) * | 2012-03-23 | 2012-08-01 | 中国科学院紫金山天文台 | Quantum cascade laser (QCL) phase-locked system using solid-state semiconductor source harmonic as reference source |
| CN102623872B (en) * | 2012-03-23 | 2014-07-02 | 中国科学院紫金山天文台 | Quantum cascade laser (QCL) phase-locked system using solid-state semiconductor source harmonic as reference source |
| CN102749341A (en) * | 2012-07-11 | 2012-10-24 | 中国科学院上海微系统与信息技术研究所 | Tomography imaging system and method based on terahertz quantum device |
| CN106442394A (en) * | 2016-09-28 | 2017-02-22 | 中国科学院上海微系统与信息技术研究所 | Terahertz near-field imaging system and terahertz near-field imaging method |
Non-Patent Citations (2)
| Title |
|---|
| 朱永浩: "三阶分布反馈太赫兹量子级联激光器的远场", 《物理学报》 * |
| 谭智勇: "太赫兹量子器件及其成像实验研究", 《现代科学仪器》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196412A (en) * | 2018-01-08 | 2018-06-22 | 山西大学 | A kind of 10MHz-10GHz optical phase-locked loops device |
| CN108196412B (en) * | 2018-01-08 | 2020-01-03 | 山西大学 | 10MHz-10GHz optical phase-locked loop device |
| CN108535891A (en) * | 2018-04-11 | 2018-09-14 | 雄安华讯方舟科技有限公司 | A kind of THz wave wave-front phase modulation method |
| WO2019196614A1 (en) * | 2018-04-11 | 2019-10-17 | 雄安华讯方舟科技有限公司 | Method for wavefront phase modulation of terahertz wave |
| CN108535891B (en) * | 2018-04-11 | 2020-01-10 | 雄安华讯方舟科技有限公司 | Terahertz wave front phase modulation method |
| CN108398691A (en) * | 2018-05-25 | 2018-08-14 | 中国工程物理研究院流体物理研究所 | A kind of difference frequency signal generation device and method |
| CN108398691B (en) * | 2018-05-25 | 2023-10-17 | 中国工程物理研究院流体物理研究所 | Difference frequency signal generating device and method |
| CN110672548A (en) * | 2019-09-18 | 2020-01-10 | 雄安华讯方舟科技有限公司 | Terahertz multimode continuous wave amplitude spectrum system and terahertz signal generating device |
| CN112964901A (en) * | 2021-02-07 | 2021-06-15 | 中南大学 | Fluid flow velocity measuring device based on terahertz high-speed echo effect |
| CN112964901B (en) * | 2021-02-07 | 2022-03-29 | 中南大学 | Fluid flow velocity measuring device based on terahertz high-speed echo effect |
| CN113608175A (en) * | 2021-08-03 | 2021-11-05 | 上海无线电设备研究所 | RCS measurement transceiving system based on quantum cascade |
| CN113608175B (en) * | 2021-08-03 | 2023-09-19 | 上海无线电设备研究所 | RCS measurement receiving and transmitting system based on quantum cascade |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107171166B (en) | 2019-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107171166B (en) | Terahertz quantum cascaded laser phase-locked system and method | |
| Jouy et al. | Dual comb operation of λ∼ 8.2 μm quantum cascade laser frequency comb with 1 W optical power | |
| CN110850129B (en) | Broadband-controllable photon millimeter wave noise signal generator and signal generating method thereof | |
| CN109462140A (en) | A kind of on piece Terahertz double frequency carding device of radio frequency injection modulation | |
| Li et al. | On-chip dual-comb source based on terahertz quantum cascade lasers under microwave double injection | |
| WO2019126573A2 (en) | Microwave or terahertz communication based on quantum cascade laser frequency comb generator | |
| Chen et al. | Measurements of 14NH3 in the ν2= 1 state by a solid-state, photomixing, THz spectrometer, and a simultaneous analysis of the microwave, terahertz, and infrared transitions between the ground and ν2 inversion–rotation levels | |
| CN107768970A (en) | A kind of pulse mode Terahertz quantum cascaded laser radio-frequency modulations system and method | |
| Hallal et al. | Synthesis of a 30-Hz linewidth wave tunable over 500 GHz | |
| CN103022890B (en) | Tunable bi-color laser system | |
| CN106918742B (en) | A kind of Terahertz quantum cascaded laser optical beat signal detection system and method | |
| Criado et al. | New concepts for a photonic vector network analyzer based on THz heterodyne phase-coherent techniques | |
| CN112146755B (en) | Device and method for generating ultra-wideband terahertz double-optical comb based on non-resonant radio frequency injection | |
| CN109975856A (en) | A kind of multi-beam microwave source based on multiplexer | |
| Corner et al. | Sum frequency generation at 309 nm using a violet and a near-IR DFB diode laser for detection of OH | |
| CN207992463U (en) | A kind of multi-beam microwave source based on multiplexer | |
| Voigt et al. | Lamb dip stabilization of a THz quantum-cascade laser | |
| WO2023184713A1 (en) | Terahertz dual-comb spectrum stabilization system | |
| Wan et al. | High-power Multi-wavelength DFB Diode Laser Array for Continuous-wave Terahertz Generation | |
| Bertrand et al. | linewidth enhancement factor of mid-IR quantum cascade lasers | |
| Waldman et al. | Prospects for quantum cascade lasers as transmitters and local oscillators in coherent terahertz transmitter/receiver systems | |
| Voigt et al. | High-resolution absorption spectroscopy with a phase-locked quantumcascade laser | |
| Baryshev et al. | Phase-locking of a 2.7-THz quantum cascade laser to a microwave reference | |
| CN116247510A (en) | Self-injection terahertz optical frequency comb system | |
| Ramkumar et al. | Quantum Cascade Lasers–Device Modelling and Applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |